I found out today that it is a custom "specialty" font, made exclusively for the blue urchin, by a designer in Portland.
Thanks everyone for your help.

Cissarz Latein NF by Nick's Fonts
https://www.myfonts.com/fonts/nicksfonts/cissarz-latein-nf/

LHF Colonial Roman by Letterhead Fonts
https://www.letterheadfonts.com/fonts/colonialroman